mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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212 lines
4.2 KiB
Go
212 lines
4.2 KiB
Go
package cli
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import (
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"context"
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"flag"
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"strings"
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)
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// Context is a type that is passed through to
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// each Handler action in a cli application. Context
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// can be used to retrieve context-specific args and
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// parsed command-line options.
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type Context struct {
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context.Context
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App *App
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Command *Command
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shellComplete bool
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flagSet *flag.FlagSet
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parentContext *Context
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}
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// NewContext creates a new context. For use in when invoking an App or Command action.
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func NewContext(app *App, set *flag.FlagSet, parentCtx *Context) *Context {
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c := &Context{App: app, flagSet: set, parentContext: parentCtx}
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if parentCtx != nil {
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c.Context = parentCtx.Context
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c.shellComplete = parentCtx.shellComplete
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if parentCtx.flagSet == nil {
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parentCtx.flagSet = &flag.FlagSet{}
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}
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}
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c.Command = &Command{}
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if c.Context == nil {
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c.Context = context.Background()
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}
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return c
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}
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// NumFlags returns the number of flags set
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func (c *Context) NumFlags() int {
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return c.flagSet.NFlag()
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}
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// Set sets a context flag to a value.
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func (c *Context) Set(name, value string) error {
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return c.flagSet.Set(name, value)
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}
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// IsSet determines if the flag was actually set
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func (c *Context) IsSet(name string) bool {
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if fs := c.lookupFlagSet(name); fs != nil {
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isSet := false
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fs.Visit(func(f *flag.Flag) {
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if f.Name == name {
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isSet = true
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}
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})
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if isSet {
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return true
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}
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f := c.lookupFlag(name)
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if f == nil {
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return false
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}
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return f.IsSet()
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}
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return false
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}
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// LocalFlagNames returns a slice of flag names used in this context.
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func (c *Context) LocalFlagNames() []string {
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var names []string
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c.flagSet.Visit(makeFlagNameVisitor(&names))
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return names
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}
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// FlagNames returns a slice of flag names used by the this context and all of
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// its parent contexts.
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func (c *Context) FlagNames() []string {
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var names []string
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for _, ctx := range c.Lineage() {
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ctx.flagSet.Visit(makeFlagNameVisitor(&names))
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}
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return names
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}
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// Lineage returns *this* context and all of its ancestor contexts in order from
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// child to parent
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func (c *Context) Lineage() []*Context {
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var lineage []*Context
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for cur := c; cur != nil; cur = cur.parentContext {
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lineage = append(lineage, cur)
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}
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return lineage
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}
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// Value returns the value of the flag corresponding to `name`
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func (c *Context) Value(name string) interface{} {
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if fs := c.lookupFlagSet(name); fs != nil {
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return fs.Lookup(name).Value.(flag.Getter).Get()
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}
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return nil
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}
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// Args returns the command line arguments associated with the context.
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func (c *Context) Args() Args {
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ret := args(c.flagSet.Args())
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return &ret
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}
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// NArg returns the number of the command line arguments.
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func (c *Context) NArg() int {
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return c.Args().Len()
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}
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func (ctx *Context) lookupFlag(name string) Flag {
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for _, c := range ctx.Lineage() {
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if c.Command == nil {
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continue
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}
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for _, f := range c.Command.Flags {
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for _, n := range f.Names() {
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if n == name {
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return f
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}
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}
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}
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}
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if ctx.App != nil {
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for _, f := range ctx.App.Flags {
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for _, n := range f.Names() {
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if n == name {
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return f
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}
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}
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}
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}
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return nil
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}
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func (ctx *Context) lookupFlagSet(name string) *flag.FlagSet {
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for _, c := range ctx.Lineage() {
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if c.flagSet == nil {
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continue
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}
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if f := c.flagSet.Lookup(name); f != nil {
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return c.flagSet
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}
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}
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return nil
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}
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func (context *Context) checkRequiredFlags(flags []Flag) requiredFlagsErr {
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var missingFlags []string
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for _, f := range flags {
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if rf, ok := f.(RequiredFlag); ok && rf.IsRequired() {
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var flagPresent bool
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var flagName string
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for _, key := range f.Names() {
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if len(key) > 1 {
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flagName = key
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}
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if context.IsSet(strings.TrimSpace(key)) {
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flagPresent = true
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}
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}
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if !flagPresent && flagName != "" {
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missingFlags = append(missingFlags, flagName)
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}
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}
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}
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if len(missingFlags) != 0 {
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return &errRequiredFlags{missingFlags: missingFlags}
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}
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return nil
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}
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func makeFlagNameVisitor(names *[]string) func(*flag.Flag) {
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return func(f *flag.Flag) {
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nameParts := strings.Split(f.Name, ",")
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name := strings.TrimSpace(nameParts[0])
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for _, part := range nameParts {
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part = strings.TrimSpace(part)
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if len(part) > len(name) {
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name = part
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}
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}
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if name != "" {
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*names = append(*names, name)
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}
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}
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}
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